How to Clean an AR-15 with CLP: A Veteran's Step-by-Step Guide

How to clean an AR-15 with CLP, step by step: disassembly, the bore, the star chamber, the bolt carrier group, where to lube, reassembly and a function check.

AR-15 bolt carrier group being cleaned with Forsaken Industries CLP and a cleaning patch

The AR-15 is one of the easiest rifles to clean once you know where carbon hides. This guide walks you through how to clean an AR-15 with CLP, step by step: disassembly, the bore, the star chamber, the bolt carrier group, the lower, where to lube, reassembly and a function check. It is written by a combat veteran who has cleaned a lot of rifles in a lot of bad conditions.

Quick answer: Unload, separate the upper and lower, pull the bolt carrier group, and break down the bolt. Scrub the bore, star chamber and bolt carrier group with CLP, wipe everything dry, then lube the bolt, gas rings, cam pin and carrier rails. Reassemble and function check. Use a carbon cleaner first if the carbon is baked on.

What You Need

Step 1: Unload and Clear the Rifle

Point the rifle in a safe direction. Remove the magazine, lock the bolt to the rear, and visually and physically check that the chamber is empty. Move all ammunition out of your cleaning area before you go any further.

Step 2: Separate the Upper and Lower

Push out the rear takedown pin and pivot the upper receiver forward. For a full clean, also push out the front pivot pin so the upper and lower come completely apart.

Step 3: Remove and Break Down the Bolt Carrier Group

  1. Pull the charging handle back and slide out the bolt carrier group (BCG). Then remove the charging handle.
  2. Push out the firing pin retaining pin from the side of the carrier.
  3. Tip the carrier back and let the firing pin slide out.
  4. Rotate the cam pin a quarter turn and lift it out.
  5. Pull the bolt out of the front of the carrier.

Put every small part in the magnetic zone of your mat. The firing pin retaining pin is the part people lose most.

Step 4: Clean the Bore

  1. Wet a bore brush with CLP, or carbon cleaner if the barrel is heavily fouled.
  2. Run it through the barrel from the chamber end toward the muzzle, working from the back of the upper receiver. Push the brush all the way out before pulling it back.
  3. Let the barrel soak for a few minutes.
  4. Switch to a jag and run wet patches, then dry patches, until they come out mostly clean.
  5. Finish with one lightly wet patch to leave a thin protective film.

Step 5: Clean the Star Chamber

The star chamber is the ring of locking lug recesses at the back of the barrel where the bolt locks up. A normal patch cannot reach it, and carbon packs into it with every shot.

  1. Thread the brass adapter onto your rod and press on a star chamber pad.
  2. Wet the pad with CLP or carbon cleaner.
  3. Insert it through the back of the upper receiver and twist several full turns.
  4. Repeat with fresh pads until one comes out clean, then finish with a dry pad.

Step 6: Clean the Bolt Carrier Group

This is where most of the carbon in an AR-15 ends up, because the direct impingement gas system vents hot gas straight into the carrier. Wet everything with CLP, or spray it with carbon cleaner if the buildup is heavy, and let it soak for 5 to 10 minutes. Then clean:

  • Bolt tail: the back of the bolt behind the gas rings. Scrub with a nylon brush. Remove the built-up carbon, but do not try to polish it to bare metal.
  • Bolt face and extractor: use a swab or pick around the extractor claw and ejector.
  • Bolt lugs: brush between each lug.
  • Inside the carrier: run a swab or rag through the bolt cavity.
  • Firing pin: wipe it clean along its full length.
  • Carrier key: run a pipe cleaner through it. Do not remove the key, since it is staked in place.

Wipe every part dry when you are done. For stubborn carbon, see How to Remove Carbon Fouling from a Gun.

Step 7: Clean the Upper Receiver and Charging Handle

Wipe out the inside of the upper with a CLP-wet rag, paying attention to the area around the chamber. Wipe down the charging handle, especially the rails it rides on.

Step 8: Clean the Lower Receiver

The lower stays much cleaner than the upper. Brush out loose debris from the fire control group and wipe the inside with a lightly wet rag. Wipe the buffer and buffer spring. Do not flood the trigger group with lube.

Step 9: Lubricate

An AR-15 runs best wet, but in the right places. Apply fresh CLP here:

Generously:

  • Bolt body and gas rings
  • Cam pin and the cam pin slot
  • Carrier rails (the shiny wear marks on the outside of the carrier show you where)

Lightly:

  • Bolt lugs
  • Charging handle rails
  • Inside of the upper receiver
  • Hammer and trigger pins (a drop each)
  • Takedown and pivot pins

Keep the firing pin channel dry unless your manufacturer says otherwise.

Step 10: Reassemble

  1. Before you install the bolt, stagger the three gas ring gaps so they do not line up.
  2. Slide the bolt into the carrier with the extractor on the right side when the carrier key is on top.
  3. Insert the cam pin, then rotate it a quarter turn.
  4. Drop the firing pin in from the back, then install the retaining pin. Tip the carrier nose-down. The firing pin should stay in.
  5. Install the charging handle, slide the BCG in behind it, and close the upper and lower.

Step 11: Function Check

With the rifle unloaded:

  1. Charge the rifle and put it on SAFE. Pull the trigger. The hammer should not fall.
  2. Switch to FIRE and pull the trigger. The hammer should fall. Keep holding the trigger back.
  3. Pull and release the charging handle, then slowly release the trigger. You should hear and feel the trigger reset.

If anything fails, do not load the rifle. Recheck your assembly or take it to a gunsmith.

How Often Should You Clean an AR-15?

  • After every range session: a quick clean and re-lube of the bolt carrier group
  • Every 500 to 1,000 rounds, or after suppressed shooting: a full clean including the star chamber and a deep clean of the bolt with carbon cleaner
  • Every 60 to 90 days in storage: a wipe-down and fresh coat of CLP

Common Mistakes

  • Running it dry. The bolt carrier group needs lube to run reliably.
  • Skipping the star chamber. It is the hardest spot to clean and the one most people miss.
  • Over-scraping the bolt tail. Remove buildup, but leave light discoloration alone.
  • Removing the gas key. It is staked on purpose. Clean it with a pipe cleaner instead.
  • Losing the firing pin retaining pin. Use a magnetic mat.

AR-15 Cleaning FAQ

Is CLP enough to clean an AR-15?

For routine cleaning, yes. CLP cleans, lubricates and protects in one step. For baked-on carbon or after suppressed shooting, start with a carbon cleaner, then finish with CLP. See CLP vs Gun Oil vs Solvent.

Should I clean the barrel from the muzzle?

Clean from the chamber end when you can. On an AR-15 that is easy, because the rod goes in through the back of the upper receiver.

How much lube does an AR-15 need?

More than most guns on the bolt carrier group. The bolt, gas rings, cam pin and carrier rails should look wet. Everything else gets a thin film.

Do I need to take the lower apart?

No. For routine cleaning, brush out debris and wipe it down. Leave the trigger group assembled.

Get everything in one box: the Advanced Gun Maintenance Bundle includes CLP, carbon cleaner, a magnetic mat, star chamber pads and swabs. For a full kit with rods and brushes, get the Complete Firearm Cleaning System.